Read Sharp LC-28HM2E (serv.man2) Service Manual online
37
LC-28HM2
AN-28SP2
HOW TO ADJUST DISPLAY UNIT INDEPENDENTLY
The unit is factory adjusted to the optimum setting. When the setting has been deviated or the parts have been
replaced, re-adjust the setting following the procedures described below.
replaced, re-adjust the setting following the procedures described below.
1. Preparation
As power source, use the stable AC power.
2. How to enter into special modes
1
Connection
Connect AC cord of the display main unit. (No connection to the AVC center unit)
Connect AC cord of the display main unit. (No connection to the AVC center unit)
2
Going into the process adjustment mode
[Procedure]
While pressing [BRIGHT] and [VOL DOWN] buttons simultaneously, switch on the main power.
Illumination of backlight indicates successful entry into this mode. If backlight does not illuminate, press
[POWER] button of the remote controller.
Illumination of backlight indicates successful entry into this mode. If backlight does not illuminate, press
[POWER] button of the remote controller.
[Contents]
Various adjustments can be performed manually by changing the value in the OSD shown on top left of the
screen.
screen.
Address Address data Data write
00
00
0
Write EEPROM setting
0
Display of test pattern inside of controller
00
00
0
Controller setting
0
Write controller setting
VOL UP
Move the cell rightward. (For 1st and 3rd lines only. Space is skipped.) Toggle switch
VOL DOWN
Move the cell leftward. (For 1st and 3rd lines only. Space is skipped.) Toggle switch
INPUT
\
Decrease adjustment value. (0 becomes F) ... 1st and 3rd lines (1 becomes 0) ... 2nd
and 4th lines
and 4th lines
INPUT
|
Increase adjustment value. (F becomes 0) ... 1st and 3rd lines (0 becomes 1) ... 2nd
and 4th lines
and 4th lines
BRIGHT
Move the lines. Toggle switch
1st line(A)
→
2nd line(B)
→
3rd line(C)
→
4th line(D)
→
1st line(A)
→
...
3
How to terminate special modes
Switch off the main power.
Switch off the main power.
3. How to reset lamp error
After parts replacement or repair, reset the lamp error (*1) in the following procedure.
Lamp error (*1)
When normal current does not run into the lamp because of inverter circuit failure or lamp damage, the display unit
microprocessor counts the occurrence of an error. When error count reaches 5 times, the backlight illumination is
disabled for protection. The error count can be reset by the following procedure.
When normal current does not run into the lamp because of inverter circuit failure or lamp damage, the display unit
microprocessor counts the occurrence of an error. When error count reaches 5 times, the backlight illumination is
disabled for protection. The error count can be reset by the following procedure.
After setting “0F 00 0” in the 1st line of the OSD, put 1 in the data write. Upon this writing, the lamp error is reset
(with “0F 00 1”).
Switch off the main power once.
Switch on the power again and confirm that the backlight works again (to be illuminated).
(with “0F 00 1”).
Switch off the main power once.
Switch on the power again and confirm that the backlight works again (to be illuminated).
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